Update JOJ3 Configuration Schema

JOJ3-Configuration-Schema.md

@@ -27,6 +27,7 @@ Health check configuration:
 Basic idea: 
 - list all stages that are to be run
 - provide config for each stage
+- for compilation we need the command and an optional list of extra files to "import"
 - various code quality tools can be used, but they all feature: 
   - a command
   - a list of tests
@@ -38,7 +39,7 @@ Basic idea:
 stages = [ "compile", "code_quality", "joj" ]
 
 [compile]
-compiler = "cmake"
+command = "cmake"
 copyfiles= [ "main.c", "task.h" ]
 
 [[code_quality]]